Surface and scale. These are elements I find attention grabbing. The subject matter here is entirely mysterious with no clues. That goes against my modus operandi because one cannot suss out what's up. But it drew me in and I like it.
These were enormous tanks for some kind of storage-- probably beer since a brewery is nearby. But it was such a gentle giant (there I go anthropomorphizing again), nestled into it's dark hollow. I found the surface so icy. It was an ice planet floating in space.